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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,774
09-30-2005, 09:44 AM
2. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 196,787
07-16-2014, 11:01 AM
1. ### helpz!

1) a car insurance company has determined that 8% of all ddrivers were involved in a car accident last year. among the 15 drivers living on one...

• Replies: 0
• Views: 4,976
03-29-2006, 02:27 AM
2. ### Likert scales and statistics

I am trying to interpret some results I have from a survey that was used to give an insight into opinions about HR and whether these differences...

• Replies: 1
• Views: 3,483
03-29-2006, 03:03 PM
3. ### Hypothesis Testing

- Could you let me know is my answer to this problem is correct? My problem with this problem was there was no standard deviation, how do you...

• Replies: 4
• Views: 3,179
03-29-2006, 03:56 PM
4. ### z score to find ranges

I am tyring to find the range of salaries earned by the bottom 20% of a group of female educators with the following data: Mean-43.195...

• Replies: 7
• Views: 4,246
03-29-2006, 07:40 PM
5. ### Simple Regression

Could you tell me what would be my y variable and x variable for this problem? I think advertising cost = y and number of orders = x :confused: ...

• Replies: 3
• Views: 3,545
03-30-2006, 10:49 PM
6. ### Inference about a Population Mean

Conditions for inference I understand that the size n of a SRS is important. But I do not understand why. Please explain. I also do not...

• Replies: 1
• Views: 3,664
03-31-2006, 11:12 AM
7. ### hypothesis testing question

Of a random sample of 100 families in Richmond, 60 own a house. Is there sufficient evidence at the 0.05 level of significance to conclude that most...

• Replies: 0
• Views: 2,031
04-01-2006, 05:22 PM
8. ### Help With Normal Distribution

When I am given a problem asking to find the lowest vaule in the top 20% of the test scores i can, but I didnt know if I was doing it right to find...

• Replies: 0
• Views: 1,860
04-01-2006, 05:36 PM
9. ### Q about % contribution

hi, I want to ask: why do we use 'Sum of Squares' in compting percent contribution and not 'effect estimate'??? :confused: thanks for help!!...

• Replies: 1
• Views: 1,901
04-02-2006, 10:09 AM
10. ### Another Hypothesis Question

OK...pls give me an idea where to start this one...I want to learn the steps, not be given the answer...I'm not looking for charity, just lost in...

• Replies: 2
• Views: 2,058
04-02-2006, 10:43 AM
11. ### Significance level in r (correlation coefficient)

Hi John: I am going Pearson correlation analyses, first in overall sample, and then I divided them into three strata or groups. r is significant...

• Replies: 1
• Views: 5,282
04-02-2006, 11:20 AM
12. ### P-value method

I have a couple of questions I would like to know if I am doing them correctly or not, any guidence would be greatly appreciated. Test the given...

• Replies: 0
• Views: 5,934
04-02-2006, 10:25 PM
13. ### Normal Distributions

ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

• Replies: 0
• Views: 2,836
04-03-2006, 11:35 PM
14. ### Can't seem to figure this out... any help?

"A shopping center developer claims in a presentation to a potential client that at least 40% of the adult female population in a community visit the...

• Replies: 0
• Views: 2,104
04-04-2006, 01:51 PM
15. ### Please check homework problem #2

:confused: Coaching and the SAT. Suppose that SAT mathematics scores in the absence of coaching vary Normally with mean mule=475 and standard...

• Replies: 0
• Views: 4,143
04-04-2006, 03:25 PM
16. ### Example Questions for a Final

Do you have any example questions for a comprehensive final? If, so please e-mail them my final is on May 8, 06. Thanks in advance Shonna

• Replies: 0
• Views: 1,982
04-04-2006, 03:45 PM
17. ### Hypothesis testing for populations?

I was hoping someone could help me out with the following issue. I am accustomed to performing t-tests on two samples to determine if there is a...

• Replies: 2
• Views: 2,229
04-05-2006, 02:06 PM
18. ### datasets finding

Hi, my first time on this forum, I will soon do a project on ANOVA and we need to design ANOVA models with 3 factors or more, can anyone provide me...

• Replies: 2
• Views: 2,195
04-05-2006, 07:09 PM
19. ### Newbie Here! Question on find number of test...

This is a three part question where we are given a set of data samples. coupon tip1 tip2 1 47 ...

• Replies: 1
• Views: 4,235
04-05-2006, 10:43 PM
20. ### Need Help Urgently

Hey guys I need help in an assignment it is due tonight, and i am clueless about what to do the assignment is here...

• Replies: 0
• Views: 2,133
04-06-2006, 01:39 PM
21. ### Post Hoc tests - significant interaction

I'm involved in a student project that is investigating the effects of anticipation on the magnitude of the reflex muscle activity in the arm. I have...

• Replies: 0
• Views: 2,337
04-06-2006, 03:11 PM
22. ### Meaning of p

Hi everyone need a bit of help. From my knowledge the p value is the chance that the null hypothesis is true so if p=0.05 then there is only a 5%...

• Replies: 1
• Views: 3,199
04-06-2006, 07:33 PM
23. ### Can you check my homework it is due 4/5/06 at 10 a.m. Eastern

:yup: Holiday Spending. "How much do you plan to spend for gifts this holiday season?" An interviewer asks this question of 250 customers at a...

• Replies: 2
• Views: 5,067
04-07-2006, 10:47 AM
24. ### simple correlation question

Dear all, I have a very simple and may be silly question about correlation. When we want to correlate two sets of scores is it necessary that the...

• Replies: 1
• Views: 2,143
04-09-2006, 02:25 PM
25. ### Can percent be a "continuous" variable?

I got percentages of lab tests meeting a desirable target range. I want to use the percentages as scores (higher the better) and compare them to...

• Replies: 1
• Views: 4,545
04-10-2006, 07:28 AM
26. ### Using a TI-84

Can you show me how to graph a histogram in the calculator:p And how to program the equations that are needed into the calculator for use on the...

• Replies: 3
• Views: 4,909
04-10-2006, 09:53 AM
27. ### normal distribution questions--am I on the right path

hi...just checking to see if I am on the right track on these problems. here is what I have: in a normal distribution with u =200 and r=30, find...

• Replies: 1
• Views: 2,377
04-10-2006, 10:01 AM
28. ### Hypergeometric distribution question

I have a homework question on capture/recapture without replacement. I'm really struggling answering the question and hope someone can help. ...

• Replies: 4
• Views: 4,010
04-10-2006, 10:15 AM
29. ### Mean and Standard Deviation-due tomorrow

The amount of time a Lakemore Statistics student spends on homework each evening is approximately normally distributed. If 22% of the 75 students...

• Replies: 1
• Views: 2,708
04-10-2006, 11:10 PM
30. ### survey and "other" responses

If a survey question offered 2 choices plus "other," when converting to variables, would this be dichotomous or nominal? (The data is not continuous,...

• Replies: 1
• Views: 2,217
04-11-2006, 07:57 AM

ok stats question.... in a recent survey of 500 high school students, 334 said that if they found \$1,000 behind a bush at school they would keep the...

• Replies: 1
• Views: 1,918
04-11-2006, 12:08 PM
32. ### confused again...

dear friends here i am again. My new query is this: i have one group of patients to be treated in a new position with ESWL: 19 obese patients with...

• Replies: 3
• Views: 1,909
tdk
04-12-2006, 12:57 AM
33. ### Are weighted means appropriate?

Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

• Replies: 4
• Views: 2,764
04-12-2006, 08:42 AM
34. ### non parametric stepwise regression

Anyone know of a nonparametric version for stepwise regression?

• Replies: 1
• Views: 2,903
04-13-2006, 07:30 PM
35. ### Likert analysis & survey - help!

Hi, Pls help. Textbooks on this topic is making me nuts :( I have a 20 qn survey looking at people perceptions on 'perceived unfairness' about an...

• Replies: 6
• Views: 3,332
04-14-2006, 11:41 AM
36. ### level of significance test with no standard deviation

Hi, one question...been doing one and two tailed tests of level of significance but have a problem without a standard deviation...How do I proceed...

• Replies: 1
• Views: 7,271
04-14-2006, 02:10 PM
37. ### Construct validity check problems

Hi, First time user here. Thanks for puttting up this forum! :tup: Background: I am writing about factors that affect the adoption of IT. ...

• Replies: 5
• Views: 3,623
04-17-2006, 08:18 PM
38. ### confounded by confounders

I chose numbers of new patients and numbers of pediatric patients as confounders for a survey of practices used in dialysis facilities. Now that I'm...

• Replies: 5
• Views: 2,843
04-18-2006, 07:51 AM
39. ### Any suggestions??

I am working on a project to construct and report results of a regression model, but I am stuck on trying to find an idea to construct. I originally...

• Replies: 3
• Views: 2,428
04-19-2006, 09:59 AM
40. ### Need help with hypothesis testing problems

Microsoft believes that if over 30% of Linux users would be interested in a particular new software package, then the company will make at least an...

• Replies: 0
• Views: 2,115
04-19-2006, 02:36 PM
41. ### How to convert a table of probabilities to j.p.d.f

Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

• Replies: 0
• Views: 2,302
04-19-2006, 05:08 PM
42. ### least regression

I am a student taking basic stats and I am not sure if I arrived at the correct answer for these could someone please let me know. Consider the...

• Replies: 0
• Views: 1,660
04-19-2006, 05:31 PM
43. ### What test to use?

I have a continuous dependent variable and an ordinal variable. I've found tests for 2 ordinal (Kendall's, Gamma), but what do I do in this case?...

• Replies: 1
• Views: 2,194
04-20-2006, 07:35 AM
44. ### chi square with 0 votes in cells

Hi! I want to analyze votes for any significant preferencies. My tables look like this: A - 12 B - 8 C- 0 D - 10 Now, the expected frequency is...

• Replies: 2
• Views: 2,798
04-21-2006, 08:09 AM
45. ### Sample size and Power

Hi I am interested in finding out the how to determine what sample size I need for a survey and how that is related to effect and power. Also,...

• Replies: 3
• Views: 2,980
04-21-2006, 02:33 PM
46. ### Help

I need help with answering this question: The average hourly pay of medical typists in a large city if \$15.00 with a standard deviation of \$2.80....

• Replies: 1
• Views: 1,779
04-22-2006, 11:09 PM
47. ### Confirmatory factor analysis

Hi, does anyone here knows a good website that explains how to perform a confirmatory factor analysis with AMOS? Thank you, Hans

• Replies: 0
• Views: 2,490
04-23-2006, 03:18 AM
48. ### null and alternate hypotheses

His agent claims that the average speed of a fastball thrown by pitcher Moe M. Down is 90 mph. If the average speed of 64 randomly selected...

• Replies: 1
• Views: 2,184
04-23-2006, 01:18 PM
49. ### least-squares prediction

A sociologist beleives that there is a tendency for tall men to marry tall women. To determine the nature of such a relationship, the heights of the...

• Replies: 0
• Views: 2,706
04-23-2006, 01:41 PM
50. ### Control Variate for normal r.v.

Hello! I would like to know what is the best/natural choice for the control variate of a normal (gaussian) random variable. Thank you.

• Replies: 2
• Views: 1,897
04-23-2006, 05:15 PM
51. ### Grouping by the dependent variable

Why should one NOT group by the dependent variable in a regression context?

• Replies: 1
• Views: 2,478
04-23-2006, 07:31 PM
52. ### Stats help

Insurance industry analysts report that the average amount of life insurance in effect in Virginia is \$92,500 with a sample standard deviation of...

• Replies: 1
• Views: 1,589
04-23-2006, 07:43 PM
53. ### How do I do this>?

How do I attempt or solve a question like this? Can someone solve it and expalin it to me as a roadmap to other problems that plague me? here it...

• Replies: 4
• Views: 2,282
04-24-2006, 10:12 AM
54. ### Urgent!

I found this post by Orangeb and its exactly the same quiz Im working on. Could anyone help Orangeb and I on this one? We both would be greatful and...

• Replies: 1
• Views: 1,742
04-24-2006, 06:19 PM
55. ### Statistical analysis for likert type scale

Hey, please help! I am currently analysing data from a likert scale, descriptive stats not a problem, it is the inferential stats im having a problem...

• Replies: 6
• Views: 16,145
04-24-2006, 08:27 PM
56. ### Unspoken ANOVA assumption

I heard that ANOVA does not like cells with small number of cases and that a small number could throw off results--and that the number is unspeicifed...

• Replies: 3
• Views: 2,221
04-25-2006, 07:52 AM
57. ### Confidence Interval Help

A usrvey of 49 randomly selected banks in New York revealed that these banks required average down payments of 35% of the purchase price of the home...

• Replies: 2
• Views: 2,619
04-25-2006, 08:52 AM
58. ### FACTOR ANALYSIS - POOLING data from different samples

I'm conducting an exploratory factor analysis to examine the factor structure of a translation of an established scale. There are 20 variables. I...

• Replies: 0
• Views: 2,865
04-26-2006, 06:14 AM
59. ### Help needed for Analysis on this complex project

Hello Friends, I have been working on this huge experiment (without a statistical background). It involved 28 participants divided into 4 Groups....

• Replies: 5
• Views: 2,085
04-26-2006, 08:22 PM

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